CN201081743Y - Cannula type flow sensor and intelligent cannula type flow meter with the cannula type flow sensor - Google Patents
Cannula type flow sensor and intelligent cannula type flow meter with the cannula type flow sensor Download PDFInfo
- Publication number
- CN201081743Y CN201081743Y CNU2007201778311U CN200720177831U CN201081743Y CN 201081743 Y CN201081743 Y CN 201081743Y CN U2007201778311 U CNU2007201778311 U CN U2007201778311U CN 200720177831 U CN200720177831 U CN 200720177831U CN 201081743 Y CN201081743 Y CN 201081743Y
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- pressure
- static pressure
- connecting pipe
- cannula type
- pipeline
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Abstract
The utility model provides an insert pipe type flow sensor and an intelligent insert pipe type flowmeter thereof, wherein, the insert pipe type sensor is composed of a pipeline radius detecting bar, an outer pipe, an inner pipe, a nozzle seat, a total pressure nozzle and a static pressure nozzle, wherein, the cross-section of the pipeline radius detecting bar is bullet-shaped; the insert pipe type sensor is vertically arranged into a pipeline from a lateral surface of the pipeline with the head end positioned on the center line of the pipeline; the bullet-shaped section is opposite to the fluid flowing direction; the total pressure nozzle and the static pressure nozzle are connected with two ports of a differential pressure transmitter through a primary stop valve, a condenser and a connecting pipe; the static pressure nozzle is connected with a pressure transmitter; the pipeline is also provided with a temperature sensor; the differential pressure transmitter and the pressure transmitter are connected with a flow integrator via a signal cable. Because the pipeline radius structure is adopted, materials are saved, and the mounting is more convenient; because the section is bullet shaped, and the separation points of the fluid are fixed, the stability of flow coefficient is excellent; a static pressure tap and a total pressure tap are prevented from being blocked; the performance of the utility model is better than a whole pipe detecting bar with a circular form or diamond shape cross-section.
Description
Technical field
The utility model relates to a kind of flow measurement instrument, and particularly a kind of industrial pipeline measurement of fluid flow cannula type flow sensor reaches by its intelligent cannula type flowmeter of forming.
Background technology
Flow measurement instrument is industrial process automation control, the indispensable instrument of energy measurement; It is widely used in the every field of national economy such as chemical industry, electric power, oil, metallurgy, is to develop production, energy savings, improve production quality, and increases economic efficiency and the important tool of management level; The mean velocity tube flowmeter of one of differential pressure flowmeter gets rapid development in recent years, and its consumption is increasing sharply; The visible Fig. 4 of even speed tube flow sensor all adopts full tubular construction at present, and length equals the diameter of measuring channel, waste material; Section configuration is subjected to the influence of Reynolds number bigger for the coefficient of flow of the even speed tube test rod of circle, rhombus, and the burble point position was fixing when fluid flow through pipe, rhumbatron, the coefficient of flow instability.Section configuration be the static pressure pressure tap of even speed tube test rod of circular, rhombus in the test rod back, stopped up by the particle of fluid, dust easily.
The utility model content
Be the deficiency of the mean velocity tube flowmeter that remedies above-mentioned full tubular construction, the utility model provides a kind of test rod only for the cannula type flow sensor of the semicanal structure of the radius of measuring channel and by its intelligent cannula type flowmeter of forming.
The utility model cannula type flow sensor, comprise test rod, outer tube, interior pipe, stub (tube), total aluminium hydraulic pressed connecting pipe and static pressure are taken over, the stagnation pressure pressure measurement tube chamber of test rod internal upper part top end sealing, the static pressure pressure measurement tube chamber of top, bottom end sealing, interior pipe connects stagnation pressure pressure measurement tube chamber and total aluminium hydraulic pressed connecting pipe, static pressure is taken over and is connected described static pressure pressure measurement tube chamber by described outer tube, it is characterized in that: described test rod length is the radius of measuring channel, xsect is that the taper of arc under the last circle is bullet-headed, open two static pressure pressure taps that communicate with described static pressure pressure measurement tube chamber at described test rod head end bottom two skew backs, become above described static pressure pressure tap described test rod after a while that row are perpendicular opens the stagnation pressure pressure tap that several and described stagnation pressure pressure measurement tube chamber communicate.
The intelligent cannula type flowmeter of forming by described cannula type flow sensor, comprise the cannula type flow sensor, equalizing valve, differential pressure transmitter and flow integrator, wherein: in described cannula type flow sensor is packed described measuring channel into from the fluid pipeline lateral vertical, its head end is on the center line of described pipeline, the round end in its sub warhead cross section is met to liquid flow direction, described total aluminium hydraulic pressed connecting pipe connects the stagnation pressure connecting pipe, described static pressure is received the static pressure connecting pipe, be connected to described equalizing valve and differential pressure transmitter between described stagnation pressure connecting pipe and static pressure connecting pipe, described differential pressure transmitter connects described flow integrator through signal cable.
By the intelligent cannula type flowmeter that described cannula type flow sensor is formed, wherein: also be connected to described pressure unit on the described static pressure connecting pipe, described pressure unit is connected to described flow integrator by signal cable.
By the intelligent cannula type flowmeter that described cannula type flow sensor is formed, wherein: temperature sensor also is housed on the described measuring channel, and described temperature sensor is connected to described flow integrator by signal cable.
The intelligent cannula type flowmeter of forming by described cannula type flow sensor, wherein: be serially connected with stop valve of static pressure on the described static pressure connecting pipe, be serially connected with stop valve of stagnation pressure on the described stagnation pressure connecting pipe.
The intelligent cannula type flowmeter of forming by described cannula type flow sensor, wherein: be serially connected with the static pressure condenser on the described static pressure connecting pipe, be serially connected with the stagnation pressure condenser on the described stagnation pressure connecting pipe.
The utility model cannula type flow sensor reaches by its intelligent cannula type flowmeter of forming, and has adopted the semicanal structure, saves material, and installs more convenient; The test rod section configuration is bullet-headed, and the point of flow separation that fluid flows through behind the test rod is fixed, the coefficient of flow good stability, and the flex point of bullet-headed section test rod is mild relatively; The static pressure pressure tap is positioned at the test rod two sides, and before point of flow separation, flow velocity is very fast, and the static pressure pressure tap is difficult for stopping up; The stagnation pressure pressure tap of bullet-headed section test rod is broader because of the warhead form front portion, forms static total nip, will stop the solid particle in the fluid to enter the stagnation pressure pressure tap; No matter stagnation pressure pressure tap, its anti-blocking performance of static pressure pressure tap all are better than the test rod that circle, rhombus detect section.
Description of drawings
Fig. 1 is that the utility model cannula type flow sensor reaches the synoptic diagram by its intelligent cannula type flowmeter of forming;
Fig. 2 is that the utility model cannula type flow sensor reaches the A-A sectional view by its intelligent cannula type flowmeter of forming;
Fig. 3 is that the utility model cannula type flow sensor reaches the application drawing by its intelligent cannula type flowmeter of forming;
Fig. 4 is the reference diagram of full tubular construction circle of tradition or diamond-shaped cross-section cannula type flowmeter.
Embodiment
For further setting forth the utility model cannula type flow sensor and, doing more detailed explanation below in conjunction with embodiment by its intelligent cannula type flowmeter of forming.
Fig. 1 is the synoptic diagram of cannula type flow sensor, by test rod 1, outer tube 2, interior pipe 3, stub (tube) 4, total aluminium hydraulic pressed connecting pipe 5 and static pressure are taken over 6 and are formed, test rod 1, outer tube 2, stub (tube) 4 and total aluminium hydraulic pressed connecting pipe 5 join successively, test rod 1 is the pipeline radius structure, test rod is the radius of measuring channel 21, xsect is the bullet-headed (see figure 2) of the taper of arc under the last circle, the stagnation pressure pressure measurement tube chamber 9 of its internal upper part top end sealing, the static pressure pressure measurement tube chamber 10 of top, bottom end sealing, two skew backs are opened two static pressure pressure taps 8 that communicate with static pressure pressure measurement tube chamber 10 in test rod 1 head end bottom, become row to erect above static pressure pressure tap 8 test rod 1 after a while and open three stagnation pressure pressure taps 7 that communicate with stagnation pressure piezometric tube 9 chambeies, wherein preceding two stagnation pressure pressure taps are at a distance of nearer.Interior pipe 3 one ends stretch in the stagnation pressure pressure measurement tube chamber 9, and the other end stretches in total aluminium hydraulic pressed connecting pipe 5, directly is communicated with total aluminium hydraulic pressed connecting pipe 5 and stagnation pressure pressure measurement tube chamber 9.Static pressure is taken over a side that is connected on outer tube 2 after 6 bendings, communicates by outer tube 2 and static pressure pressure measurement tube chamber 10.
Cannula type flow sensor 11 adopts the sub warhead streamlined section.The stagnation pressure pressure tap 7 and the static pressure pressure tap 8 of intubate flow sensor are accepted stagnation pressure, static pressure respectively, and be connected with "+" "-" end of differential pressure transmitter 17 respectively, the output differential pressure signal, pressure unit 15 is connected the output pressure signal with static pressure connecting pipe 14, thermal resistance thermometer records temperature simultaneously, after these signals input integrating instruments carry out computing, show relevant data, according to bernoulli equation:
1, the basic calculating formula of flow rate calculation
Wherein:
U: speed (m/s);
Δ P: differential pressure (kPa.);
ρ: detected fluid density (kg/m
3);
2, working medium flow
Volumetric flow rate:
Mass rate: Q=Q ' * ρ
Wherein:
Q’：m
3/h；
Q：kg/h；
D: caliber (m);
K: correction factor, dimensionless;
System's pie graph 3 of the intelligent cannula type flowmeter of forming by the cannula type flow sensor, cannula type sensor 11 is packed into from fluid pipeline 21 lateral vertical in the pipeline, its head end is on the center line of pipeline 21, total aluminium hydraulic pressed connecting pipe 5 is through stop valve 22 of stagnation pressure, stagnation pressure condenser 23, stagnation pressure connecting pipe 24 is connected on the interface of differential pressure transmitter 17, static pressure takes over 6 through stop valve 12 of static pressure, static pressure condenser 13, static pressure connecting pipe 14 is received another interface of differential pressure transmitter 17, between stagnation pressure connecting pipe 24 and static pressure connecting pipe 14, be connected to equalizing valve 16 and differential pressure transmitter 17, also be connected to pressure unit 15 on the static pressure connecting pipe 14, temperature sensor 20 also is housed, differential pressure transmitter 17 on the pipeline 21, pressure unit 15 and temperature sensor 20 are through signal cable 18 connection traffic integrators 19.
Wherein:
1, cannula type flow sensor:
The cannula type flow sensor adopts the flow detecting element of the streamlined detection section of sub warhead, and the static pressure pressure tap places technology such as side, has advantages such as coefficient of flow is stable, measuring accuracy is high, anti-dust obstruction.The pitot hole of cannula type flow sensor and baroport are accepted stagnation pressure, static pressure respectively, and are connected the output differential pressure signal respectively with differential pressure transmitter "+" "-" end.
2, stop valve:
Total static pressure interface of cannula type flow sensor is respectively installed a stop valve, but effect is the medium between isolating pipelines and the transmitter in case of necessity.The withstand voltage heat resistance of selected valve satisfies the pressure and temp requirement of pipeline internal medium.
3, condenser (water filling balance tank):
The effect of condenser is to make steam be condensed into water, and is full of in the connecting pipe, makes high-temperature steam and transmitter isolation, the protection sensor.The hole on condenser top is used for water filling.When fluid flows such as measurement water, oil, air, rock gas, do not need to install condenser.
4, pressure unit:
Accept static pressure, output 4---20mA signal is used for Media density is carried out pressure compensation; Do not need pressure unit when being stressed and influencing very little fluid when measuring water, wet goods density.
5, equalizing valve (claiming three valve groups again):
Be generally equalizing valve and two other valve sets and be fitted together the three valve groups that formation comprises equalizing valve, also can be described as three groups of valves, be used for differential pressure transmitter and adjust zero point.
6, differential pressure transmitter:
Accept stagnation pressure, static pressure, measure the differential pressure of stagnation pressure and static pressure, promptly Δ P exports the 4----20mA signal.
7, temperature transmitter:
Medium temperature in the measuring channel, output 4～20mA is used for Media density is carried out temperature compensation.Measure temperature influence, during the very little fluid flow of variable density temperature transmitter can be installed.
8, intelligent Folw Displaying Integrator:
Linking to each other with pressure unit, differential pressure transmitter, temperature transmitter by lead, is the secondary table that shows measurement result.
Intelligent flow-integrating instrument is the new digital instrument that adopts the single chip microcomputer technology design.Can be used as secondary Displaying Meter with all types of flow sensors of simulating signal output.Be applicable to the flow of steam, gas, liquid measure, demonstration, integrating, be equipped with pressure, temperature transmitter, the density of energy convection cell obtains high precision standard volumetric flow rate or mass rate because of the measuring error that pressure, temperature variation cause compensates and corrects.
Flow Measuring System is installed
This system does not allow any seepage, gives birth to influence otherwise convection current measures volume production.When measuring the liquid that water, steam etc. easily condense, when being lower than 0 ℃, environment temperature must accompany heat and insulation.Gas measurement system is used suds and is checked seepage.
1, the installation of intubate sensor:
Two kinds of structure installation forms: flange connects or directly welding.
Straight length requires: the upstream is not less than 10D, and the downstream is not less than 5D.
Installation direction: when horizontal pipeline section is measured steam flow, must below pipeline, install, measure other medium and the vertical pipe direction can be any.The intubate pitot hole facing to MEDIA FLOW to, promptly the flange groove or install the pipeline side facing to MEDIA FLOW to.Pipeline bores or gas cutting Φ 24 holes, and intubate pitot hole center line should overlap (angular deviation is less than 3 °) with pipe centerline.
2, stop valve
When dispatching from the factory, this flowmeter has been welded on the interface of cannula type flow sensor.
3, the installation of condenser
Do not need to install condenser during fluids such as measurement water, oil, air, rock gas.
Horizontal pipe is measured the steam flow condenser and is installed as Fig. 3, and two condenser height should be consistent.Installation dimension: H=20-100; D 〉=R+r; Wherein R is the pipeline radius, and r is an insulation layer thickness.
4, differential pressure transmitter, pressure unit, comprise the installation of three valve groups of equalizing valve
Differential pressure transmitter is connected with three valve groups, and its "+" is connected with the stagnation pressure conduit, and "-" is connected with the static pressure conduit, and pressure unit is connected on the static pressure conduit, all should be contained in the instrument box.
5, the installation of temperature transmitter
Be contained in beyond the cannula type flow sensor downstream 5D, pipeline bores or gas cutting Φ 22 holes, is welded on the pipeline with the transmitter pillar.
6, connecting pipe
Connecting pipe length generally should be in 16m, and no longer than 50m, bore should be greater than 10mm, the vertical or installation of tilting of connecting pipe, and degree of tilt should be greater than 1: 12; Must not there be liquid to produce when being gas in two connecting pipes, must not have gas to produce when being liquid, otherwise the differential pressure signal that differential pressure transmitter is accepted exerts an influence.Blowoff valve can be adorned in the connecting pipe bottom.
System's operation
1, system can open three valve groups after installing, and the water filling port on the drainer of outwarding winding is filled to two equal full waters of jar in a mouth, screws nut and does not produce leakage, and guarantee that no bubble exists in the connecting pipe.Open two valves; Gas or liquid measure needn't water fillings; Should drive two valves earlier to high-temp liquid, treat liquid cooling after, open the equalizing valve and the stop valve thereof of three valve groups, can not have steam bubble to exist in the connecting pipe.Close the equalizing valve of three valve groups.
2, connect the 220V power supply of " flow shows the integrating view ", whole measuring system promptly puts into operation.
3, shut down requirement and cut off the 220V power supply earlier, data kept function after this intelligent flow-integrating instrument had power down.Automatically preserve the parameter of power down time, integrated flux, manual operator setting etc., the holding time can reach 10 years.
When 4, noticing that pipe medium pressure is higher than 10MPa, drive the equalizing valve that the valve order must be opened three valve groups earlier, valve-off for closing equalizing valve at last, damages to prevent the unidirectional superpressure of differential pressure transmitter in proper order.
After putting into operation as certain flowmeter more than the 10MPa,, then at first must open the equalizing valve of three valve groups, close other valve again because of certain reason need be dismantled differential pressure transmitter; After the new differential pressure transmitter of packing into puts into operation, also must drive equalizing valve earlier, open other valve again, close equalizing valve and promptly put into operation again.
Claims (6)
1. cannula type flow sensor, comprise test rod (1), outer tube (2), interior pipe (3), stub (tube) (4), total aluminium hydraulic pressed connecting pipe (5) and static pressure are taken over (6), the stagnation pressure pressure measurement tube chamber (9) of test rod (1) internal upper part top end sealing, the static pressure pressure measurement tube chamber (10) of top, bottom end sealing, interior pipe (3) connects stagnation pressure pressure measurement tube chamber (9) and total aluminium hydraulic pressed connecting pipe (5), static pressure is taken over (6) and is connected described static pressure pressure measurement tube chamber (10) by described outer tube (2), it is characterized in that: described test rod (1) is the radius of measuring channel, xsect is that the taper of arc under the last circle is bullet-headed, open two static pressure pressure taps (8) that communicate with described static pressure pressure measurement tube chamber (10) at described test rod (1) head end bottom two skew backs, become in the top of described static pressure pressure tap (8) described test rod (1) after a while that row are perpendicular opens the stagnation pressure pressure tap (7) that several and described stagnation pressure pressure measurement tube chamber (9) communicate.
2. intelligent cannula type flowmeter of forming by the described cannula type flow sensor of claim 1, comprise measuring channel (21), cannula type flow sensor (11), equalizing valve (16), differential pressure transmitter (17) and flow integrator (19), it is characterized in that: described cannula type flow sensor (11) is packed into from the fluid pipeline lateral vertical in the described measuring channel (21), its head end is on the center line of described pipeline (21), the round end in its sub warhead cross section is met to liquid flow direction, described total aluminium hydraulic pressed connecting pipe (5) connects stagnation pressure connecting pipe (24), described static pressure is taken over (6) and is received static pressure connecting pipe (14), be connected to described equalizing valve (16) and differential pressure transmitter (17) between described stagnation pressure connecting pipe (24) and static pressure connecting pipe (14), described differential pressure transmitter (17) connects described flow integrator (19) through signal cable (18).
3. according to the intelligent cannula type flowmeter of claim 2, it is characterized in that: also be connected to described pressure unit (15) on the described static pressure connecting pipe (14), described pressure unit (15) is connected to described flow integrator (19) by signal cable (18).
4. according to the intelligent cannula type flowmeter of claim 3, it is characterized in that: temperature sensor (20) also is housed on the described measuring channel (21), and described temperature sensor (20) is connected to described flow integrator (19) by signal cable (18).
5. according to the intelligent cannula type flowmeter of claim 3, it is characterized in that: be serially connected with a stop valve of static pressure (12) on the described static pressure connecting pipe (14), be serially connected with a stop valve of stagnation pressure (22) on the described stagnation pressure connecting pipe (24).
6. according to the intelligent cannula type flowmeter of claim 3, it is characterized in that: be serially connected with static pressure condenser (13) on the described static pressure connecting pipe (14), be serially connected with stagnation pressure condenser (23) on the described stagnation pressure connecting pipe (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201778311U CN201081743Y (en) | 2007-10-15 | 2007-10-15 | Cannula type flow sensor and intelligent cannula type flow meter with the cannula type flow sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201778311U CN201081743Y (en) | 2007-10-15 | 2007-10-15 | Cannula type flow sensor and intelligent cannula type flow meter with the cannula type flow sensor |
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| Publication Number | Publication Date |
|---|---|
| CN201081743Y true CN201081743Y (en) | 2008-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201778311U Expired - Fee Related CN201081743Y (en) | 2007-10-15 | 2007-10-15 | Cannula type flow sensor and intelligent cannula type flow meter with the cannula type flow sensor |
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|---|---|
| CN (1) | CN201081743Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111551219A (en) * | 2020-05-18 | 2020-08-18 | 重庆市科学技术研究院 | Pitot tube structure |
| CN111551218A (en) * | 2020-05-18 | 2020-08-18 | 重庆市科学技术研究院 | Pitot tube flow measuring instrument |
-
2007
- 2007-10-15 CN CNU2007201778311U patent/CN201081743Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111551219A (en) * | 2020-05-18 | 2020-08-18 | 重庆市科学技术研究院 | Pitot tube structure |
| CN111551218A (en) * | 2020-05-18 | 2020-08-18 | 重庆市科学技术研究院 | Pitot tube flow measuring instrument |
| CN111551219B (en) * | 2020-05-18 | 2021-11-09 | 重庆市科学技术研究院 | Pitot tube structure |
| CN111551218B (en) * | 2020-05-18 | 2021-11-09 | 重庆市科学技术研究院 | Pitot tube flow measuring instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080702 Termination date: 20151015 |
|
| EXPY | Termination of patent right or utility model |